Stop motion for knitting machines



W. T. BARRATT STOP MOTION FOR KNITTING MACHINES July 10; 1923.

Filed Nov. 18. 1921 3 Sheets-Sheet 1 July '10, 1923.

w. T.;BARRATT STOP MOTION FOR KNITTING MACHINES 3 Shee'fs-Sheet 2 Filed NOV. 18. 192i July 10, 1923. 1,4611J172 w. T. BARRATT STDP MOTION FOR KNITTING MACHINES Filed Nov. 18 1921 3 Sheets-Sheet 5 I r: f 33 r 64 v i i i 5 s i i i I l l, i i} w 4;; if 4/ a/1-- Q+-,;

: :w 4 Ill 4 7/ I if fw/veTz/tor a m W Patented July 10, 1923.

PATENT OFFICE.

WILLIAM 'r. BARRAT or snnnineron, VERMONT.

STOP MOTION FOR KNITTING MACHINES.

' Application filed November 18,1921. Serial No. 516,040.

T 0 all whom it may com-em Be it known that I, /VILLIAM T. BARRATT,

a citizen of theUn'ited States, residing at Bennington in the county of Bennington and State of Vermont, have invented new and useful Improvements in Step 'Motions for Knitting Machines, of which the following is a specification.

- This invention relates toimpr oveinents in stopniotio n mechanisms formachines 111 which a strand or strands of yarn are employed inthe manufacture of fabric.

The particular embodiment of my invention hereinafterset forth in the specification and embodied in the claims is especially adapted for use in connectio n with knitting machines. j

The object of the invention is to provide a stop mechanism which will stop the machine when the yarn fed into the machine is subjected to excess tension or undue strain, as for example; when the strand of yarn becomes knotted or has kinks or enlargements therein, said stop motion mecha nism being adapted to operate to stop the ,machine under such conditions.

The ob ect of the invention is particularly to provide a very sensitive stop motion, whereby a machine employing the lightest v and frailest kinds of yarn maybe stopped" when said yarn is not operating properly whereby the and is subjected to a tension same becomes broken.'

Another object of the. inventionis to provide means whereby a plurality of yarn .gulding mechanisms may be slmultaneously thrown into and out of operative position.

v Another object of the invention isrto provide means for regulating the tension on the yarn by means ofthe yarn guides. 7

.Other objectsand desirable results to be obtained will be more fullyhereinafter set forth in the specification. j

The invention. consists particularly in the yarnguid'e mechanism which is very delicately positioned and adjusted to operate to actuate the stop motion mechanism when the yarn breaks orwhen the tension on the yarn for any reason becomes slack or fails altogether; 7

i This invention is'in some respects similar to the inventionpatented by me No. 1,173,-

244, I patented February 1,186,645, 'patented June 13, 1916, in so far 29, 1916 and No.

. pro ved stop mechanism. I

" the rotary and normally stationary stop members, but differs from the said inven-- tions embodied in said Letters Patent in the means which guides' the thread and which operates to stop therotary stop member. As in said Letters Patent the present invention contemplates as one embodiment there or a clutch mechanism wh1ch 1S thrown out of operation by a stop mechanism whereupon. a brake 18 applied to stop the machlne quickly and said stop mechanism'emb'odies tionary stop member which is movable toward and away from the rotarystop member.

pearing in the specification, the invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims.

Referring to the drawings: Figure 1 .is a sectional plan of my im- Fi 2 is asectional elevation taken on the line 22 of Figure 1.

Fig. is an enlarged planview of the particularly novel part of my invention.

Fig. 1 is a sectional elevation taken on the line l 1 of Figure 3.

Fig. 5 is a detail front elevation of the yarn guide stop mechanism.

Fig. 6 is an enlarged detail section of the frictional device for the counterweight.

" Like numerals refer to like parts throughout the several views of the drawings.

in the drawings, 10 is the frame of the machine. 11 is the main driving shaft; 12 is a pulleyforming one member of a clutch and 13 is the other member of said clutch. let is a rock shaft having an arm 15 thereon which engages the clutch member 13 to throw the same into or out of engagement with said clutch pulley 12. 16 is the stop mechanism and 17 the brake. 18 is a dog fast to a rock shaft 19, which when rocked ary stop members comprising bars extend- .ing longitudinally of the machine and arranged to slide thereon. 27 and 28 are rock shafts having arms .29 and 30 respectively fastened thereto and said arms being connected together by a connecting link-31.

The mechanism hcreinbefore specifically described is substantially the same as disclosed in-said Letters Patent.

' The normally stationary stop 25 is moved toward and away from the rotary stop member 23 by an arm 32 which is fastened to the arm 29 and projects upwardly therefrom into aslot extending longitudinally along the underside of the normally stationary stop 25. 'sion; 34 thereon which has adjustably at- The arm 29 has an upward extentached thereto an arm 35 which has a counterweight 36-adjustably fastened thereon. A link 37 is pivoted at 38 to the upper end of the arm 34: and its free end projects through a slot 39 provided in a stop plate -,lO.. Said link is provided in its upper edge with a notch all into which the upper edge of said slot 39 projects. Said link 37 is held in the position illustrated in Fig. 2 by a spring 42. An arm 4C3 fast to the rock shaft let is adapted to engage the upper edge of the link 37, when the stop motion mechanism is operated, to throw the link 37 downwardly out of engagement with the upper edge of the slot39, whereupon the arm 35 will cause the arm 34 to be tipped from the position illustrated in full lines to the position shown in dotted lines Fig. 2, thus through the arm 32 causing the normally stationary stop member 25 to be moved out of operative position relatively to the rotary stop member 23. The arm 43 is operated to engage the upper edge of the link 37, as hereinbefore described, by the rocking of the rock shaft 14- to which it is fastened, and the rock shaft M is operated in the same manner as the rock shaft 30 described in i said Letters Patent No. 1,173, 44., page 2,

lines 53 to 82 inclusive. It is evident that a spring may be used to move the arm 34; from the position shown in full lines to that shown in dotted lines, instead of employing theweighted arm 35, without departing m from the spirit of my invention.

A handle la; fastened to the rock shaft l4 enables said rock shaft to. be manually operated when desired. The rock shaft 27 may be manually operated when desired by means of the extension arm 3t.

An arm 4-1 is fastened to the rock shaft full lines Fig. 5,

28 and has a pin l5 extending upwardly therefrom into a slot 46 which slot extends longitudinally along the underside of the normally stationary stop 26 and by this means said normally stationary stop 26 may be moved toward and away from the rotary stop members 24: through the medium of the connecting link 31 and arm 30. Each of the normally stationary stop members 25 and 26 is provided with two series of oppositely disposed brackets 4:7 and &3, see Figs. 3, at and 5, which are fast to their respective normally stationary stops.

Referring to Figs. 3, i and 5, the bracket 4:? has a rock shaft 1-9 pivotally mounted thereon and at one end of said shaft an arm 50 is fast thereto and projects upwardly and laterally at 51 to receive a yarn guide 52. This arm is provided with a slidably adjustable weight 53 which is held in adjusted position by a spring 54, F 6. A stationary yarn guide 55 is positioned above the yarn guide 52 and is fastened to the bracket 45. Another yarn guide 56 is positioned below the yarn guide 52 and is mounted upon bracket 57 which is adjustably fastened to the bracket 47, so that'the yarn guide 56 can be adjusted toward and away from the yarn guide 52 to increase or diminish respectively the tension upon the yarn 58, which yarn extends from a bobbin 59, Figure 1, through a stationary yarn guide 60 fast to the frame of the machine, through the yarn guides 56, 52 and 55 and thence passes to the machine where it is guided to the needles in the usual manner. The arm 50 is normally, that is when the yarn is passing through the yarn guide 52 under tension during the operation of the machine, positioned at a slight angle to a vertical plane containing the axis of the rock shaft 49. It is prevented from assuming at any time a vertical position by abutting. against the bracket 57, so that when the yarn 58 breaks the arm 50 and yarn guide 52 will tipfrom the position shown in full lines, Fig. 5. to the position shown in dotted lines inclined toward the right in said figure and with a locking arm 61 fast to or forming a part of the rock shaft 49 abutting against the normally stationary stop 25.

As will be seen by reference to Figs. 3, 4 and 5. when the arm 61 is in its elevated position as shown. in full lines in said ligures, it will be out of the path of the rotary stop member 23 and at that time the yarn guide will be in the position illustrated in and the yarn will be passing therethrough under tension.

W hen the yarn breaks the" yarn guide 52 and its arm 50, with the counterweight 53 being located in a plane slightly inclined toward the right, Fig. 5, from avertical plane, said yarn guide and its arm will drop to When this occurs .the stop mechanism of the machine will be operatedto throw out the clutch and stopthe machine, as setforth in said Letters Patent No. 1,173,244.

Any tendency to bend the arm 61 rearwardly is prevented by a vertical pin 62 fast to and projecting upwardly from the normally stationary stop 25; When the nor-- mally stationary stop 25 is moved rearwardly, that is to the right in Fig. 3, the rocking arm 61 engages the inclined edge 63 of a cam plate 64 which is fastened to a stationary bar 65, which in turn is fastened by brackets 66 to the frame of the machine.

and as said arm 61 engages theinclined edge 63- during the rearward motion of the normally stationary stop 25,. upon which it is *and the rock shaft 49 with the arm 50 and yarn guide -52, -will.bemoved toward and approximately to the position illustrated in full lines, Fig. 5, but there will be a certain amount of play allowed for the yarn guide 52 from the position where the arm strikes the bracket 57 to the position where the arm .61 strikes the upper edge of the plate 64, so thatwhen the yarn first starts to take. up its slack motion and finally inthe operation of the machine the tension on the yarn becomes normal.

The yarn guide 52 only has tobe moved a very slight distance in order to position it as shown in fullilines, Fig. 5, and the.

strain on the yarn, necessitated by moving the yarn guide 52 to this position, is very slight on account of the position of the arm 50 which is slightly inclined, as hereinbefore set forth, to a vertical plane.

is moved rearwardly, bv the inclined edge 63 0f aplate 64 fastened to the stationary 65.

The operation ofthe yarn gnide52 and its associated parts is the same as that of i the yarn guide 52 hereinbefore described, the

only difference being that the arm 61' projects in the opposite direction from that in which the arm 61 projects and the arm 61 engages the plate 6 1 instead of the plate 6 1-.

The yarn guides on the opposite side of the machine, which are operated in connection withthe rotary stops 2% and the normally stationary stops 26, are the same as hereinbefore described with relation to the yarn guides for the rotary stops 23 and nor mally stationary stops 25.

The number of bobbins and the number of yarn guides and rotary stops may be increased as desired and all will operate as hereinbefore described.

An alarm device is provided in this machine and is substantially the same asthe alarm device shown and described in said Letters Patent No. 1,186,645 and consists of anarm 67 which engages a spring 68 to hold said spring out of engagement with one of the rotary members 23 when the stationary stop member is in its forward position and the arm 67 is fast to the rock shaft 27 and is tipped thereby to allow the spring clicker 68 to engage one of the rotary members 23 when the normally stationary stop member 25 is thrown back.

The general operation of the mechanism which has been specifically and to some extent in general described is as follows Assuming the machine to be in operation and the parts to be in the relative positions illustrated in the figures of the drawings, if a thread slackens or breaks, or if, for any reason, the normal and proper operation of the machine in respect to the feeding of the yarn is interfered with, the yarn guide or 52', through which the yarn passes which is not operating properly, or which has be come broken, immediately drops from the position illustrated in full lines F 5 to the position illustrated iii-dotted lines therein, whereupon the locking arm 61 or 61, as the case may he, drops to the position illustrated in dotted lines in said figure and engaged by its respective rotary member 23 and. by the normally stationary member 25, where upon the rotation of the shaft 2]. will be stopped and through suitable mechanism will operate the stop mechanism 16 in the same manner as set forth in said Letters Patent No. 1,173.2.44- to throw the clutch member 13 out of operative engagement with the clutch pulley 12 and the brake 17 will be set to stop the machine. During the latter part of this stopping operation the rock shaft 14 will cause the rocker arm 43 to engage the link 37 as herciubefore set forth and move the same downwardly so that the weighted arm 3 5 will cause said link 37 to be moved a from the positionillustrated in full lines to that illustrated in dotted lines, Fig. the arm 35 assuming the position illustrated in dotted 111168 in said figure. This will cause the normally stationary stop members 25 and 26 with their respective brackets at? &

and LS and their yarn guides 56, 56, 52, 52, and 55 and all other instrumentalities mounted on said. normally stationary stop members to be moved out of operative position rolativly to their respective rotary stop members,as hereinbefore described. At the same time the clicker (38 will be thrown into engagement with the teeth of the rotary stop member 23 and operates as set forth in said I Letters Patent No. 1,186,6-l5. As the nor mally stationary stop member is moved away from the rotary stop members, the arms (51 and 61 ride upon the inclines (3 -3 and (53 on their respective plates (at and M and the yarn guide is brought into position to be rethreaded, that is, into a position approximately that illustrated in full lines in Fig. 5 in which position the yarn guide 52 can be moved toward the left, Fig. 5, until the arm 50 strikes the bracket 57 and toward the right until the arm 61. engages the upper edge of the plate (5-1. Atter the difficulty which has caused the machine to stop has been remedied, the operator releases the brake and sets the stop motion in the position shown in Fig. 1. He then throws the clutch in and the machine starts, and as soon as the tension on the yarn has become sufficient to cause said arms to pick up the different yarn guides 56 and 56 and move them slightly toward a vertical plane and into the position illustrated in Fig. 5 in full lines and the operator is warned by the clicker 68 snapping over the teeth of one of the rotary stop members that the stationary stop members are out of position, he throws the stationary stop members into position by means of the extension arm 34, or by means of any conveniently positioned handle not shown in the drawings which ever may be the most convenient. This ac tion moves the link to the position illustrated. in full lines. Fig; 2, and held up against the stop plate 40 with the notch ll in engagement therewith by the spring The machine is then in o1 )erative position in every respect and the stop motion set ready to detect any other flaw that may appear in the yarn or any difficulty that may develop in the feeding of said yarn.

It will be understood. that if the operator wishes to stop the machine for any. reason such for ii'istance as to replace a broken needle, examine the fabric, put in a new bobbin, etc, he can throw the clutch member 13 out by means of the handle i l and the machine will then stop of its own inertia without using the brake or actuating the stop mechanism, but the normally stationary stop members will be thrown out because the arm d3 will engage the link 37 and allow the weighted arm 35 to throw the arm 32 back and the normally stationary stop member will be moved back out of operative position. The resulting advantage being that the operator can turn the machine by hand as he may desire without having to turn it against the friction of the brake and furthermore, when the machine is again started the operator does not have to release the brake and set the stop. again but can throw in the clutch and immediately start the ma chine in operation, and then when the yarns have picked up their respective yarn guides he moves the normally stationary stop members forward into operative position and said normally stationary stop members become automatically locked in position by the arm 34: and link 37.

it will further be understood that in every case, whether the machine is stopped automatically or by hand, that the dropping of the yarn guides from the position shown in full lines, Fig. 5, to that shown in dotted lines and the stopping of the machine occurs before the normally stationary stops are moved out of operation and then just as the machine is stopped the normally stationary stops are operated to throw the same out of operative position and the yarn guides are positioned substantially in the position illustratedin full lines, Fig. 5, andready to be positioned as shown in Fig. 5 in full lines by the yarns when the machine is again started.

I claim:

1. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a guide for a strand of yarn, a pivotally mounted member to which said yarn guide is attached, locking means actuated by said pivotally mounted member and normally held out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said pivotally mounted member into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may'be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said shaft. 7

2. A stop motion mechanism for a knitting machine h aving, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, a guide for a strand of yarn mounted on said rock shaft, locking means actuated by said rock shaft and normally held out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed'by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by. the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft.

3. A stop motion mechanism for a knitting machinehaving, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, a guide for a strand of yarn mounted on said rock shaft, an arm on said rock shaft constituting a locking means and normally held out'of engagement with said stop members by said strand of yarn when under tension during'the operation of said knitting machine, said arm being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member maybe stopped and mechanism actuated by the stopping of said rotary'stop member constructed and arranged to stop-the rotation of said driving shaft.

4. A stop motion mechanism for a knitting machinehaving, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, a pair of arms on said rock shaft, a guide for a strand of yarn on one of said arms, the other of-saidarms constituting a locking means and normally held'out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be rocked by said rock shaft intointerlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member maybe stopped, and-mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft.

5. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, 21 rotarystop member, a normally stationary stop member adjacent thereto, a rock shaft, an arm on said rock shaft, a yarn guide fora strand of yarn on said arm. said .arm adapted to bepositioned at a slight angleto a vertical plane containing the axial line of said rock shaft, another arm on said rock shaft constituting a locking means and normally held out of engagement with said step members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being" adapted to be moved by said rock shaft into interlocking engagement with. said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation,

of said driving shaft.

6. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, an arm on said rock shaft, a guide for a. strand of yarn 011 said arm,

locking means on said rock shaft and nor mally held out of engagement with Sillfl stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, a pair of oppositely disposed yarn guides located on opposite sides respectively of said rocker arm yarn guide, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft.

7. A. stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, an arm on said rock shaft, a guide fora strand of yarn on said arm, locking means on said rockshaft and normally held out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, said yarn guide arm being normally positioned by said yarn when under tension during the operation of said knitting machine at an angle containing the axial line of said rock shaft, adjust-able means adapted to engage said arm and prevent its assuming a vertical position, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft.

8. A, stop motion mechanism for a knitting machine having, in combination, a driving shaft. a rotary stop member, a nor mallv thereto. a rock shaft, an arm on said rock shaft. guide for a strand of yarn on said arm, locking means on said rock shaft and normallyheld out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarnso to do, whereby the rotation of said rotary stop member may be stopped, a pair of oppositely dis- 1 posed yarn guides located on opposite sides stationary stop member adjacent respectivel of said rocker arm yarn guide,

' shaft.

9. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member, means constructed and arranged to move said stationary stop member out of operative posit-ion relatively to said rotary stop member, means to lock said stationary stop member in operative position relatively to said rotary stop member, a guide for a strand of yarn, a pivotally mounted member mounted on said stationary stop member to which pivotally mounted member said yarn guide is attached, locking means on said normally stationary stopmember actuated by said pivotally mounted member and normally held out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said second-named locking means being adapted to be moved by said pivotally mounted member into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft and means to operate said first-named locking means to release said stationary stop memher and allow the same to be moved out of operative position.

10. A stop motion mechanism for knitting machines having, in combination, a driving shaft, a plurality of rotary stop members, a normally stationary stop member adjacent thereto common to all of said rotary stop members and movabl toward and away from said rotary stop members, a plurality of guides for strands of yarn, a pivotally mounted member for each of said yarn guides, locking means on each of said pivotally mounted members normally held out of engagement with said stop members by its respective strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by its respective pivotally mounted member into interlocking engagement with one of said rotary stops and said normally stationary stop when allowed by its respective strand of yarn so to do, whereby the rotation of said rotary stop members may be stopped while said normally stationary stop member is stationary and mechanism actuated by the stopping of said rotary stop members constructed and machines having, in combination, a driving shaft, a driven member constituting a stop,

a normally stationary stop member adjacent thereto and movable toward and away from said driven member, a pivotally mounted member, a guide for av strand of yarn mounted on said pivotally mounted member, looking means actuated by said pivotally mounted member and normally held out of engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said. pivotal-1y mounted member into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped and mechanism actuated by the stopping of said rotary stop member, constructed and arranged to stop the rotation of said shaft.

12. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a guide for a strand of yarn, a pivotally mounted member to which said yarn guide is attached, locking means actuated by said pivotally mounted member and normally held out of interlocking engagement with said stop members by said strand of yarn Y when under tension during the operation of said knitting machine, said lockin means being adapted to be moved by said pivotally mounted member into interlocking engagement. with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by the. stopping of said rotary stop member constructed and. ar' ranged to stop the rotation of said shaft and move said locking means out of interlocking engagement with said stop members.

13. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a

guide for a strand of yarn, a pivotally mounted member to which said yarn guide is attached, locking means actuated by said pivot-ally mounted member and normally held, out of interlocking engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said pivotally mounted member into interlocking engagement with said stops when allowed by said yarn so todo, whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and. ar-

ranged to stop the rotation of saidshaft and move said locking means out of interlocking said knitting machine, said locking means being adapted to be moved by .said rock shaft into interlocking engagement with said stops when allowed by saidyarn so to .do, whereby the rotation ofsaid rotary stop member may be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to {stop the rotation of said driving shaft, and move said lOCklH means out of interlocking en gagement with said stop members.

15. A stop motion mechanism for time ting machine having, in combination, a

driving shaft, a rotary stop member, a nor mally stationary stop member adjacent thereto, a rock shaft, a guide fora strand of yarn mounted on said rock shaft, locking means actuated by said rock'shaft and normally held out of interlocking engagement with said "stop members by said strand of yarn when under tension during the operation. of said knitting; machine, said locking means being: adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation 05 said rotary stop member may be stopped, and inechanisiu actuated by thestopping of said rotary stop member constructed and arranged to stop the rotation of said drlving shaft and more said locking means out of interlocking engagement with said stop members and said yarn guide into operatii 'e position 16. A stop motion mechanism for a knitting machine having, dr' inn' shaft, a rotary stop member, normally s ie-nary stop member adjacent thereto, a rock shaitt, a'guide for a strand of yarn mounted on said rock shaft. an arm on said rock shattfconstituting locking;-

Iiiims and normally held out ofinterlocltinp; engaoeinent with'said stop members by said strand of yarn when under tension during the operation 'otsaid knitting; machine, said arm being; adapted to be moved by said rock. slmttt into interlocking engagement withsaid stops when allowed by said yarn so to do, whereby the rotation of said rotary stop mcn'iber may be stop iicd and mechanism actuated by the stop ,of said rotary stop member constructed and-arranged in combination, a

to stop the rotation oi. said driving shaft and more said arm out oiii'iterloclring engagement with said stop members.

17. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member" adjacent thereto, a rock shaft, a guide for a strand of yarn mounted on said rock shaft, an arm on said rock shalt constituting a locking means and normally hold out of interlockin; engagcmei'it with said stop members by said strand of yarn when under tension duringg'the operation of said knitting machine, said arm being adapted to be moved by said rock shaft into interlocking engage mcnt with said stops when allowed by said yarn to do, whereby the rotation of said rotary stop member may be stopped and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving sha'tt and'move said arm out of interlocking engagement with said stop members and said yarn guide into operative position.

-18. A stop mot-ion mechanism for a knitmachine having, in combination, a drivinn Shah, a rotary stop member, normally stationary stop member adjacent thereto, a rock shaft, a pair of arms on said rock shaft, a guide for a strand of yarn on one of said arms, the other of: said arms constituting a locking means and normally held out of interlocking engagement with said stop members by said strand of yarn when under ten sion during the operation of said knitting machine, said locking means being adapted to be rocked by said rock sl'iai't into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop. member may he stopped, and mechanism actuated by the stopping of said rotary stop member con structed; and arranged to stop the rotation of said driving shaft and move said arm which constitutes a locking means out of intcrloclting engagement with said stop members. I i

T29. stop motion aechanism tor a knittint: machine having, in combination, a driv' sha tt,a rotary stop member, a normai s51: tionury stop member adjacent thereto lt shaft, :1 pair of arms on said roclt shaft. 1: gruidc tor a strand of yarnon enoof d arms, the other of said arms constitut' 1 means and normally held out o engagement with said step in aid strand O'i' yarn when under t ion during); the operation of said a J I 1,461,172

' at a slight angle to a vertical plane containing the axial line of said rock shaft, another arm on said rock shait constituting a locking means and normally held out of interlockin g engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to l e moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, where- ,by the rotation of said rotary stop member may be stopped, and mechanism actuated by the StOPPlH of said rotary stop member constructed and arranged to stop the rotation of said driving shaft and move said aim constituting a locking means out of interlocking engagement with said stop members.

21. A stop motion mechanism for a knit ting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a rock shaft, an arm 011 said rock shaft, a yarn guide for a strand of yarn on said arm, said arm adapted to be positioned at a slight angle to a vertical plane containing the axial line of said rock shaft, nother arm on said rock shaft constituting a locking means and normally held out of interlock ing engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said locking means being adapted to be moved by said rock shaft into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft and move said arm constituting a locking means out of interlocking engagement with said top members and said yarn guide into operative position.

22. A stop motion'mechanism for a knitting machine having, in combination, a driving shaft, a, rotary stop member, a normally stationary stop member, means constructed and arranged to move said stationary stop member out of operative position relatively to said rotary. stop member, means to lock said stationary stop member in operative position relatively to said rotary stop member, a guide for a strand of yarn, a pivotally mounted member mounted on said stationary stop member to which pivotally mounted member said yarn guide is attached, locking means on said normally stationary stop member actuated by said pivotally mounted member and normally held out of interlocking engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said second-named locking means being adapted to be moved by said pivotally mounted member into interlocking engagement with said stops when allowed by said yarnso to do, whereby the rotation of said rotary stop member may be stopped, mechanism actuated by the stopping of said rotary stop member constructed and aranged to stop the rotation of said driving shaft and means to operate said firstnamed locking means to release said stationary stop member and allow the same to be moved out of operative position together with said second-named locking means, whereby said second-named locking means may be moved out of interlocking engage ment with said stop members.

23. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member, means constructed and arranged to move said stationary stop member out of operative position relatively to said rotary stop member, means to lock said stationary stop member in operative position relatively to said rotary stop member, a guide for a strand of yarn, a pivotally mounted member mounted on said stationary stop member to which pivotally mounted member said yarn guide is attached, locking means on said normally stationary stop member actuated by said pivotally mounted member and normaly held out of interlocking engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said second-named locking means being adapted to be moved by said pivotally mounted member into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said driving shaft and means to operate said first-named locking means to release said stationary stop member and allow the same to be moved out of operative position together with said second-named locking means whereby said second-named locking means may be moved out of interlocking engagement with said stop members, and means adapted to be engaged by said second-named locking means to move said yarn guide into operative position.

24:. A stop motion mechanism for a knitting machine having, in combination a driving shaft, a rotary stop member, a normally stationary stop member, a guide for a strand of yarn, locking means normally held out of interlocking engagement with said stop members by aid strand of yarn when under tension during the operation of said knitting machine, said looking means being adapted to be moved into interlocking engagement with said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped, mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of said shaft, said last-named mechanism embodying means adapted to move said normally stationary stop member, together with said locking means away from said rotary stop member and stationary means adapted to engage said locking means and move said yarn guide into operative position.

25. A stop motion mechanism for a knitting machine having, in combination, a driving shaft, a rotary stop member, a normally stationary stop member adjacent thereto, a

rock shaft, a, guide for a strand of yarn mounted on said rock shaft, an arm on said rock shaft constituting a locking means and normally held out of interlocking engagement with said stop members by said strand of yarn when under tension during the operation of said knitting machine, said arm being adapted to be moved by said rook shaft into interlocking engagement With said stops when allowed by said yarn so to do, whereby the rotation of said rotary stop member may be stopped and mechanism actuated by the stopping of aid rotary stop member constructed and arranged to stop the rotation of said driving shaft, said mechanism embodying means to move said stationary stop member and said arm which constitutes a locking means way from said rotary stop member and out of interlocking engagement with said stop members and means adapted to engage said arm when said normallystationary stop member is being moved away from said rotary stop member and rock said shaft to move said yarn guide into operative position.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM T. BARRATT. Witnesses:

FRANK HURLEY, ALBERT LA FRANCHISE. 

